Gear-rolling machine.



H. N. ANDERSON. GEAR ROLLING MACHINE. APPLICATION man JULY 16; 1914.

Patented Sept; 25, 1917.

6 SHEETS-SHEET l- H. N. ANDERSON. GEAR ROLLING MACHINE.

APPLICATION FILED JULY 16.1914. ,H.

Patented Sept. 25, 191?.

s SHEETS-SHEET 2.

// FIG. 13

H. N. ANDERSON. GEAR ROLLING MACHINE. APPLICATION FILED JULY 16.1914.

Patented Sept. 25, 1917.

6 SHEETS-SHEET 3,

H. N. ANDERSON.

GEAR ROLLING MACHINE.

5: APPLICATIgN FILED JULY 16.1914. Patented-Sept. 25,

' 6 SHEETS-SHEET 4.

H. N. ANDERSON. GEAR ROLLING MACHINE.

5 APPLICATION FILED JULY I6. I9H- p s p 2 1917' 6 SHEETS-SHEET s.

H. N, ANDERSON- GEAR ROLLING MACHINE. APPLICATION FILED JULY 16. 1914'-v '1 ,240,91 5, Patented Sept. 25, 1917.

6 SHEETS-SHEET 6.

nn'rann sraarnna W HAROLD N. ANDERSON, OF CLEVELAND, OHIO, ASSIGNOR TOTHE ANDERSOIF ROLLED GEAR COMPANY, OF CLEVELAND, OHIO, A CORPORATION OFOHIO.

eEAn noLLINe MACHINE.

- 1,2dih915.

Application filed July 16, 1914.

To all whom it may concern:

Be it known that I, HAROLD N. Arznnnson, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of ()hio,have invented a new and useful Improvement in Gear-Rolling Machines, ofwhich the following is a specification.

In United States Patent Number 1,001,799, issued to me August. 29, 1911,I disclosed a machine for rolling teeth on gear wheels, in which anadvance over the prior art resided in maintaining substantially fixedvelocity ratio between the die-roll and blank, this feature'bein gclaimed broadly.

in an application co-pending herewith, Se

with the die, so it will not require excessmetal inthe blank to insureperfect teeth. Another object is to insure adequate support for theblank and prevent its moving in the holder, without imposing excessivestrain on the bearings of the machine. Another object is to provide forautomatically starting and stopping rotation of the blank, and anotherobject is to provide for automatically clamping the blank in theholder'before it starts to rotate and releasing it after rotation hasceased. Another object is to atlord simple means for adjusting themachine so it will roll gears of given diameters and provide graduatedscales to show the size for which it is set. Another object is toprovide for moving the die-roll to and from the blank without moving thetiming gears.

'lhese and other objects are attained in the structure shown in theaccompanying drawings in which:

fl igure 1 is a plan of my machine.

Fig. 1 isa fragmental detail of parts seen in Fig. 1.

Fig. 2 is-a, similar plan, with the parts Specification of LettersPatent.

Patented Slept. 25, l ll l.

Serial No. 851,275.

shown in the position they will occupy at the end of the gear rollingoperation.

Fig. 3 is a front elevation of the machinewith the parts in the positionshown in Fig. 2.

Fig. l is aplan of a portion of the blank holding and clampingmechanism, at the time a blank is being inserted.

Fig. 5 is a detail of a modification of the blank clamping device.

Fig. 6 is a fragment of the die roll.

Figs. 7 and 8 are elevations respectively of the right and left hand endof the machine.

Fig. '9 is a plan of the mechanism for moving toggle.

Fig. 10 is an elevation of the part shown in Fig. 9.

c Fig. 11 is an enlarged detail of some parts shown in Fig. 7.

Fig. 12 is a detail of the blank clamping disks.

Fig. 13 shows a structure wherein the universal joint is replaced by atransverse shaft and a bevel gear arrangement.

Fig. 14: shows a modification wherein the blank is movable instead ofthe die-roll.

Fig. 15 shows in rather diagrammatic form an arrangement for rollingbevel gears, using the universal joint and toggle.

Similar numerals refer to similar parts throughout the several. views.

The several parts of my machine are mounted on a base 10 which has anexten sion 11 to carrythe motor 12. The motor pinion 13 meshes with agear. 1 carried by a shaft 15 mounted in suitable bearings on the base.A gear 16 loosely mounted on the shaft meshes with a gear 17 rigidlysecured to a shaft 18 mounted in bearings 19 and 20. A gear. 21 rigidlysecured to shaft 18 meshes with a gear 22 mounted in bearings 24 and 25.

A carriage is mounted to move transversely on the base and carries thedie-roll Ill in bearings 32. A universal joint 33 connects the die-rollto shaft. As the structure of this joint is not part of the present.invention a detaileddescription oi? its mechanism is unnecessary here. Alink 34- is mounted to swing in a horizontal plane be tween lugs 35%5,and a similar link, 36, is mounted to swing between lugs 37-37. A shaft38 passes through the Free ends of those links and through one end of alink 39, the other end of which is connected to the carriage 30. Theshaft 38 passes through another link 40, which is attached to a fol=lower 41 arranged to slide in guides on the I base. A screw 42 isconnected to the follower and slides longitudinally 1n bearings 43*43,between which a gear 44, threaded to receive ,the screw, is confined. Agear 45,

loosely mounted on shaft 15, meshes with this gear. A gear 46, alsoloose] mounted on shaft 15, meshes with a 'gear' 47 rigidly mounted onan intermediate shaft 48, said sha carrying another rigidly. attachedgeai, 49, which meshes with gear 44.

clutch member 50 is rigidly attached to each of gears 45 and 46 andarranged to rotate freel on shaft 15, and a clutch member 51 is splinedon the shaft between them and adapted to shift longitudinally from theposition shown in the several figures to drive either gear 45 or 46 inunison with the shaft. A shifting lever 52 is pivoted at 53 and manuallyoperated through a link 54 by a lever The thread of screw 42 is soinclined, and the direction of rotation of shaft 15 such that, assumingthe shaft is rotating, if the clutch member 51 be moved to engage theclutch member 50 attached to gear 46 the follower will be movedto theleft; the operation in this case being through gears 46, 47,

49, and 44. Movement of the-follower to the left moves the toggle,comprising links 34, 36 and 39 into the position it occupies in Fig. 2,drawing the carriage toward shaft 18. A rod 56 attached to lever 52'passes through a lug 57 on the follower, which lug, coming in contactwith a nut on the rod,

rocks the lever 52 and disengages-the clutch member 51 at any desiredpoint, which is preferably when the toggle reaches a cenu id position. Amark 34A on link 34 registers with an index 35A carried by lug 35 whenthe toggle is central, see Figs. 1 and 2.

Throwing the member 51 to the right rotates the gear 44 in the oppositedirection and'returns the parts to the pbsition shown in Fig. 1. Alongitudinally movable shaft 60 is mountedin bearings 61 carried by thebase,

in longitudinal alinenient with shaft 18. A

' cam block 62 is loosely mounted on the end of this shaft and arrangedto move the shaft longitudinally through a thrust hearing 62A, the lowerportion of the block thereof (see Fig. 1") being flat and resting incontact with ablock 63 carried'by the car- I riage, avhich keeps the camfrom rotating, The cam block has an incline 64 which terininates in aslight decline and a plane 65 perpendicular to the axis of the shaft.This is most clearly seen, where it is somewhat exaggerated. in Fig. 4.A block 66 carried 65 by the carriage has an abutment 67 which rides upthe incline 64 as the carriage moves forward and after passing down thedecline before mentioned rides on the plane 65 during the remainder ofthe movement of the carriage. The opposing ends of the shafts 70 18 and60 are provided with disks 70 having faces adapted to hold a blank. Anarm 71 pivotally mounted on lug 35 carries a roller which lies in anannular groove in shaft 60. By means of an arm shaft 60 may be 76 movedlongitudinally. A spring 60A moves the shaft 60 toward shaft 18 and theshaft is moved in the opposite direction-by an arm 72 when a blank is tobe inserted andwhen the arm is 'released the spring maintains 80sufficient pressure against the blank to keep it in place temporarily.The movement of the carriage is sufficient to remove the block 66 fromthe path of block 62,so the latter may pass the former, as in'FigI 4,when a blankis to be inserted. When the carriage is brought forward theabutment 67 engages the incline 64 and forces the shaft toward the shaft18 thereby clamping theblanln versal of the parts. That is, a block 66Ahas an incline 64A succeeded by a short decline and a plane 65A. The lug67A is part of ablock loosely' mounted on shaft 60, cor responding toblock 62 in Fig. 4 and the incline 64A engages lug 67A and moves thisblock and hence shaft 60, thus clamping the blank as before described.Fig. 12 shows the face of a disk having both annular and radialribs,-the former to prevent expansion of the blank. A ball thrustbearing 73 is interposed between the block 62 and the shaft 60. A

The die-roll is placed between shrouds 7 5 which confine the metal ofthe blank and force it to fill out the teeth. By the use of these excessmetal in the blank is unneces-. sary. The shrouds are of such shape thatthe space between them increases uniformly from the bottom of the dieteeth to the pcripheries .of theshrouds (see Fig. 6).

A follower 80 is mounted-to slide on the front'of thebase and isconnected by a link 81 to a lug on the end of link 39. A bell cranklever 82 is pivoted tothe base, one

.arm of which carries a roller running in a cam race in the follower.The other armis bifurcated and provided with opposing I rollers whichlie in an annular groove 83 in a clutch member 84 which is splined onshaft 15. The other member of this clutch, 85, is

secured to gear 16. This clutch, which is normally disengaged, is throwninwhen the roller on the bell crank rides up to the upper level of therace, this occurring shortly before thetoggle reaches center. v

The operation of the machine will now be explained: Starting with Fig. 1and assumingthe blank has been inserted between the disks'70, the lever55 is thrown to the right, throwing the clutch member 51 into the lefthand clutch member 50. Rotation of gear 4 1 moves the knuckle of thetoggle toward the center, thereby bringing the carriage forward. Theabutment 67 soon engages the incline 64 and forcing the shaft 60 to theleft causes the projections to sink into the blank. About the time theabutment passes over the decline and begins to ride on the plane 65,-the roller on the bell crank 82 reaches the high part of the race andthrow ing in the clutch 84-85 startsthe blank and die-roll to rotating.Inasmuch as gears 21 and 22 have respectively the same number of teethas the blank and die-roll, the distance from the axis of the die-roll tothat of the blank will only exceed the distance be tween shafts 18 and23 by about half the depthat'the time the die-roll comes in contact withthe blank. This is because the diameter of the blank is about that.ofthe pitch circle of the finished gear. The universal. joint 33 willtlrereforebe so nearly parallel to slnyft 18 that the speed ratio of theblank and die-roll will be substantially the same as that of the gears21 and 22. The attachment of link 39 to the carriage 30 is by gmeans ofa block 90, to which the link is "pivotally attached, and a screw 91. pscrew passes through'a depending log 92 10 This on the carriage and isthreaded into the rear end of the block. The screw is turned with ahand. wheel 93, having graduations on its periphery. When the properposition is attained the block is secured to the carriage by nuts 94. Anindex 95 carried by the block moves over a scale on the carriage. Thesegraduations represent units of diameter while those on the hand wheelrepresent fractions of units.

The die-roll and blank may be allowed to rotate together for a shorttime with the toggle centered which will improve the surface of theteeth, particularly with respect to scale, of which there will bepractically none. At the proper time the clutch 51 is thrown to theright and the parts returned to the position shown in Fig. 1. The gear22 and die'roll may be used to roll any gear of their pitch, but thegear 21 must have the same number of teeth that the blank is to have.The bearings 24; and 25 are mounted on a separate plate which is movedbackward or forward to' accommodate different ...Bringing the die-roll.and blank together with a toggle has the advantage that the operatorcannot help making the gears the correct size if the machine 18 properlyadjusted. It has the further advantage of bringing the die up tothe'blank rapidly compared to its progress after the rolling begins.

The change is accompanied by a. proper:

tional increase in power which is also ad vantageous. Relaxing theclamping pressure against the blank relieves the bearihgs and preventsundue wear, at the same time avoiding unnecessary expenditure of power.The convenience of inserting the blank enables operation onthe blank tobegin within so short a time after it leaves the furnace that littleheat is lost. The importance of this is due to the fact that the bestresults are attained when the temperature of the blank is above thecritical point of the steel, and'as excessive heating of the blank isundesirable, if not dangerous, the less time there is lost between, thefurnace and opera- .tion on the blank the better.

Fig. 13 shows a structure wherein the universal joint is replaced by anarrangement of bevel gears. This die-roll is mounted on-shaft 100journaled in bearings 101 on carriage 30, and carries a bevel gear 102which meshes with a, gear 103 splined on shaft 10%. This shaft is gearedto shaft 18. F or the purpose of changing the number of teeth to beformed on-the blank gears 102 and 103 are mounted in a frame 105 whichmay be removed with them and substituted by another having the desiredgears attached.

In Fig. 1 1 the die-roll and blank are trans posed.

Fi g. 15 shows an arrangement for rolling bevel gears, in which a shaft110 carries a timing gearlll and die-roll 112. The timing gear 113 isconstantly in mesh with gear 111, as gears 21 and 22 are, and isconnected to drive the blank 11% by a universal joint 115, the blankbeing carried by a member 116 whichis pivoted at 117. The

screw42 actuates the toggle 1l8119, in the 1. In a gear rolling machine,the combination of a rotatably mounted shaft carry ing a blank-holder, agear rigidly secured to the shaft, a second gear rotatably mount ed withits axis parallel to the first andtheir teethenmeshed, a die-rollrotatably mounted with its axis parallel to the shaft and capable ofmoving toward the shaft without disturbing the parallelism, and aflexible connection between the die-roll and second gear whereby thedie-roll is caused to rotate at substantially the same velocity as saidsecond gear.

In a gear rolling'machine, the combi-,

nation of a rotatably mounted shaft carry ing a blank-holder, a gearrigidl secured to the shaft, a second gear rotata'b y mounted with itsaxis parallel to the first and their teeth enmeshed, a die-rollrotatably mounted with its axis parallel to theshaft and capable ofmoving toward the shaft without disturbing the parallelism, a flexibleconnection between the die-roll and second gear whereby the die-roll ismade to rotate at substantially the same velocity as said second gear,and means for moving the rotating die-roll 'toward a blank mounted inthe blank-holder to form teeth on the blank.

3. In a gear rolling machine, the combination of a rotatably mountedshaft carrying a blank-holder. a gear rigidly secured to the shaft, asecondgear rotatablymounted with its axis parallel to the first andtheir teeth enmeshed, a die-roll rotatably mount-- ed with its axisparallel to the shaft and capable of moving toward the shaft withoutdisturbing the parallelism, a flexible con nection between the die-rolland secondgear whereby the die-roll is made to rotate at; substantiallythe same velocity as saidsecoinl gear, and a toggl whereby to move therotating die-roll and press it against a blank held in the lank-holderuntil teeth are formed on the blank;

4. In a. gear rolling machine, the combination of a rotatably mountedshaft carr v ing ablank-holder, a gear rigidly secured to the shaft. :1second gear r'otatahly mounted with its axis parallel. to the tirst andtheir teeth enmeshed. a die-roll rotatahly mounted 'with its axisparallel to the shaft and capablc of moving toward thesliaft withoutdisturbing the parallelism; a universal joint connecting the die-rolland second gear wherebv the die-roll is made as rotate atsuhstantiallythe same velocity as the second gear, and a toggle whereby to move therotating die-roll and press it against a blank held formed or: theblank.

' 5. In a gear rolling machine. the combination ol' a rotatably mountedshaft carrying a bl.-ink-holdcr, a gear rigidly secured to the shaft. asecond gear rotatably nio.unt' ed with its axis pa. allel to the tirstand their teeth enmeshed. a die-rollrotatably mounted with its axisparallel to the shaft and capable of moving toward the shaft witliontdisturbing the parallelism, nieans for moving the die-roll and pressingit against a blank carried by the holder, means eminent 'ing thedie-roll and second gear whereby the movingdie-roll is madeto rotate atsub in the blank-holder until teeth are ing a blank-holder, a gearrigidly secured to the shaft, a second gear rotatably mounted with itsaxis parallel to the first and their t-ttftlbtlllntb'lletl', a die rollrotatably mounted with its axis parallel to the shaft and capable ofmoving toward the shaft without disturbing the parallelism, means formoving the die-roll and pressing it against a blank carried by theholder, means connecting the die-roll and second gear whereby the movingdie-roll. is-iiiade to rotate at substantially the same velocity-as thesecond gear, means actuated. by said die -r0ll moving means forelainping the blank in the holder and subsequently relaxing the pressureslightly. said means actingovhile the die-roll approaches but before ittouches the blank and maintaining the modified pressure until theoperation of rolling teeth on the blank is finished. Y

7. .In a gear rolling machine, the combination of a rotatably mountedshaft carrying a blank-holder. a gear rigidly secured to the shaft, asecond gear rotatably mounted with its axis parallel to the first andtheir teeth enmeshed, a. die-roll rotatably mounted withils axisparallel to the shaft and capable of moving tow a rd the shaft withoutdisturbing the parallelism, a toggle for moving the dieroll and pressingit against a blank carried the die-roll and second gear whereby theyare. made to rot-a to at substantially the same velocity, anduueansactuated by the toggle for claniping the blank in theholdcr andsubsequently relaxing the pressure slightly,

-said means acting while the die-roll ap- 'proaches but b'etore ittouches the blank and maintaining the modified pressure until theoperation of rolling teeth on the blank is linished.

S. in. gear rolling machine, the combination of a rotatably mountedshaft carrying a blank-holder, a gear rigidly secured by the holder, auniversal joint connecting:

to the shaft, a second gear rotatably inount- -ho-lde1" and subseguentlyrelaxing the pressure slightly, ,gncans acting while the die-rollapproaches but before it touches the blank and maintaining the modifiedpres. sure until the operation of rolling teeth on the blank isfinished, and an adjusting device whereby the teeth of the die-roll maybe caused to sink into the blank to a prede termined depth by the timethe toggle reaches its central position, said device having a graduatedscale to aid in setting it.

9. In a gear rolling machine, a base, a dieroll, a carriage thereformovable on the base, a toggle to move the carriage, a rotating shaft,and means for connecting the shaft to the toggle for the purpose ofoperating it. 10. In a gear rolling machine, a base, a die-roll, acarriage therefor movable on the base, a toggle to move the carriage,means for operating the toggle, and screw operated adjusting means forvarying the position occupied by the die-roll with reference to the basewhen the toggle is straight, said adjusting means having graduationswhereby to set it.

11. In a gear rolling machine, a base, a die-roll, a carriage thereformovable on the base, a toggle to move the carriage, a rotating shaft, ascrevv'connected to the knuckle of the toggle, a rotatable nut. on thescrew, said nut being longitudinally stationary, and a clutchto connectthe nut to the shaft.

12. In a gear rolling machine, a base, a die-roll, a carriage thereformovable on the base, a toggle to move the carriage, a rotating shaft,ascrew connected to the knuckleof the toggle, a rotatable nut on thescrew, said nut'being held from longitudinal movement with reference tothe base, a clutch member loosely mounted on the shaft and havingdriving connection with the nut, another clutch member splined ontheshaft, and means for engaging the clutch members to rotate the nut.

13. In a gear rolling machine, a base, a die-roll, a carriage thereformoyable on the base, a toggle to more the carriage, a rotating shaft, ascrew connected to the knuckle of the toggle, a rotatable nut on thescrew, said nut being longitudinally stationary, a clutch member looselymounted on the shaft and having driving connection with the nut, anotherclutch member splined, but capable of longitudinal movement, .on theshaft, a

- lever to move-saidmember into engagement with the first clutch member,and an adjustable throw-out 'to disengage the clutch members when theknuckle has moved to a 'predetermined point.

14-. In a gear rolling machine, abase, a die-roll, a carriage thereformovable .on the base, a toggle to move the carriage, a rotating shaft, ascrew connected to the knuckle of the toggle, a rotatable nut on thescrew,

said nut being longitudinally stationary, a pair of clutch membersloosely mounted on the shaft and each I g ared to th nut, one ofshifting said member whereby to cause the rotatable blank-holder mountedthereon, a

them being arranged to rotate the nut in a direction opposite to that ofthe other, a

clutch member splined but capable of longitudinal movement on the shaft,a lever for nut to be rotated, and adjustable throw-outs to disengagethe clutch members when the knuckle has moved to predetermined points.15. Ina gear rolling machine, a base, a

die-ro1l, a carriage therefor movable on the base, a toggle to move thecarriage, a rotating shaft, a screw connected to the knuckle of thetoggle, a rotatable nut on the screw,

said nut being longitudinally stationary,

connecting means whereby the shaft may be made to rotate the nut, aclutch member connected to and adapted to rotate the blank-holder anddie-roll,- a companion clutch member mounted to rotate in unison withtheshaft, and automatic means for engaging the clutch members when theknuckle reaches a predetermined position.

16. In a gear rolling machine, a base, a rotatable blankl1older mountedthereon, a die-roll, a carriage therefor movable on the 'base, a toggleto move the carriage, a rotating shaft, a screw connectedto the knuckleof the toggle, a rotatable nut on the screw, said nut beinglongitiulinally stationary, connecting means whereby the shaft may bemade to rotate the nut, means for clamping a blank in the holder, saidmeans being operated by the carriage as it moves toward theblank-holder, a clutch member connected to and adapted to rotate theblank-holder and die-roll, a companion clutch member which rotates inunison with the shaft, and automaticmeans for engaging the clutchmembers after the blank is clamped to the holder 17 In a gear rollingmachine, a pair of 1 gears rgtatably mounted upon relatively fixed axeswith their teeth enmeshed, a blank holder connected to one of the gearsand a die-roll adapted to roll teeth on'bevel gears connected to theother, one of said connections being flexible, whereby to permitrelative movement of approach between the die-roll and blank-holder.

18. In a gear rolling machine, a pair of gears rotatably mounted uponrelatively fixed axes with their teeth enmeshed, a blank-holderconnected to one of the gears and a'dic-roll adapted to roll teeth onbevel gears corniected to the other, one of said connections beingflexible, whereby to perother, one of said connections being flexible,139

whereby to permit relative movement of approach between the die-roll andblankholder, a toggle connecting the die-roll and blank-holder wherebyto cause said movement of approach, and a device for adjusting thetoggle so the die-roll will sink into the blank a predetermined depth bythe time the toggle teaohe its central position,

'said device having a graduated scale to indicate the depthof the teethwhen the toggle is central.

20. In a gear rolling machine, a pair of gears rotatably mounted uponrelatively fixed axes with their teeth enmeshed, a blank-holderconnected to one of the gears and a die-roll adapted to roll teeth ongears connected to the other gear, ,one of said connections including auniversal joint which permits relative movement of approach between thedie-roll and blank-holder.

21. In agear rolling machine, the combination of a pair of gearsrotatably mounted upon relatively fixed axes with their teeth enmeshedand their axes parallel, a blankholder connected to one of the gears anda dic-roll adapted-to roll teeth on gears connected to the other gear,one of said connections being flexible, thereby permitting relativemovement of approach between the die-roll and the blank-holder. v

22. In a gear rolling machine, the combination of a pair of gearsrotatably mounted upon relatively fixed'axesnvith their teeth enmeshedand their axes parallel, a blankholder connected to one of the gears anda die-roll adapted to'roll teeth on gears connected to the other ear,one of said connections be:- 11g flexib e, thereby permitting relativemovement of approach between the die-roll and blank-holder, and meansfor causing said movement of. approach.

23. In a gear rolling machine, the combi: I

nation of a pair of gears rotatably mounted with their teethenmeshed andtheir axes relative movement of approach between the die andblank-holder, and means for dissociating the aforesaid means from saidele ment when the die and blank-holder have attained a predeterminedrelative position.

25. In a gear rolling machine, a die, a blank-holder, operating meanswhereby a rolling movement is effected between the die and a blankcarried by the holder, and means actuated by said operating means forproducing relative movement of approach be tween'the die andblank-holder.

26. In a gear rolling machine, a die, a blank-holder, operating meanswhereby rolling movement is effected between the die and a blank carriedby the holder, means actuated bysaid operating means for producingrelative movement of approach between the die and blank-holder, andmeans for suspending the movement of when the die and blank haveattaineda predetermined relative position.

27; In a gear rolling machine, a die, a blank-holder, operating meanswhereby rolling movement is effected between the die and a blank carriedby the holder, and means actuated by said operating means wherebyrelative movement of approach between the die and blank is effected atvarying velocity relative to the velocity of said rolling movement.

28. In a gear rolling machine, a die, a blank-holder, operating meanswhereby rolling movement is effected between the die and a blank carriedby the holder, and means actuated by said operating means wherebyrelative movement of approach between the die and blank is effected atdiminishing velocity relative to said rolling movement.

29. In a gear rolling machine, a die, a blank-holder, operating meanswhereby roll- 'ing movement is efiected between the die and .a blankcarried byl-the holder means actuated by said operating means, wheie byrelative movement of approach between the die and blank is effected, andmeans for suspending said movement of approach when the die and blankhave attained a predetermined relative position, said meanswherebvmovement of approach is efiected proach being so constructed asto maintain the relative position of the die and blank after movement ofapproach has been suspended. 30. Ina gear rolling machine, a die roll, ablank-holder. an operating element, means operated by said element forrolling the die roll on a blank carried by the holder, means operatedbysaid element for producing relative movement of approach between the dieroll and blank, and means for suspending said movement of approach whenthe die roll and blank have attained a desired relative position.

31. In a gear rolling machine, the combination of a pair of gearsrotatably mounted with their teeth enmeshed and their axes parallel, ablank-holder connected to one of the gears and a die-roll connected tothe other gear, one of said connections being a universal joint whichpermits relative movement of approach between the die-roll andblank-holder, and a toggle connecting the die-roll and blank-holder,whereby to cause said movement of approach. I

32. In a gear rolling machine, the combination of a pair of gearsrotatably niounted with their teeth enmeshed and their axes ma amparallel, a blank-holder connected to one of the gears and a die-rollconnected to the other gear, one of said connections being a universaljoint which permits movement of approach between the die-roll and blanleholder; a toggle connecting the die-roll and blankholder whereby tocause said move; ment of approach, and a devicefor adjustiiigthe toggle,so the die-roll will sink into the blank a predetermined depth-by thetime the toggle is in, its central position, said device having agraduated scale the depth for which the toggle is set.

33. In a gear rolling machine, the combination of a longitudinally fixedrotatable shaft, a longitudinally movable rotatable shaft mounted inaxial alinement With the first shaft, a disk end of each shaft, and amounted on the first shaft; a second gear 'rotatably-n'iounted with itsaxis parallel to the first gear, said gears having their teeth"enmeshed, a die-roll rotatably mounted With its axis parallel to that ofthe shafts and capable of moving toward and away from the shafts withoutdisturbing said parallelism, and a connection between the die-roll andsecond gear whereby they are made to rotate at substantially equalvelocities as the'die-roll approaches a blank held between the disks.

In a gear rolling machine, a tooth forming die, a blank-holder, andmeans of a nature to produce movement of approach thcrebetween untilthey are a predetermined distance apart and then automatically suspendsaid movement of approach.

35. In a gear rollingmachine, a toothhforming die, a blank-holder, meansof nature to produce movement of approach therebetween until they are apredetermined distance apart, and then automatically sus- 1 pend saidmovement of approach, and means for adjusting said moving means so itwill bring them to any desired distance apart.

36. In a gear rolling machine, a toothforming die, a blank-holder, andmeans for of approach therebe tween, Withconstantly diminishingvelocityand proportionately increasing power. 7 n a gear rolling machine, abase, a longitudinally fixed shaft and a longitudh nally movable shaftmounted in hearings on the base with their axes in alinement, theadjacent ends of the shafts being adapted to receive and clamp a blankbetween them; a carriage, adapted to support a dieroll, transverselymovable on the base, an abutment on the carriage and a cam on. themovable shaft, said cam having an incline. Whereon the abutment rides asthe carriage approaches the shafts and forces the movable to-Wa'rd thefixed shaft to clamp ablaiik between them, and: a plane perpendicula'rto the shaft Whereon the abutment throw in the clutch. to indicaterigidly mounted on thegear rigidly a d1e-roll, transversely slightlylower-than the highest rides after-it has passed the incline, said planebeing slightly lower than the highest part of the incline, therebypermitting a slight retrogression of the shaft and consequent relief ofend thrust in the bearings; a constantly rotating shaft, a toggle whereby to move the carriage, a clutch to connect the rotating shaft with oneof the blanlecarrying shafts, and a connection. eetween the toggle andclutch whereby to when the carriage reaches a predetermined point.

38.In a gear rolling machine,. a base,- a longitudinally fixed shaft anda longi tudinally movable shaft mounted in bearings on the base withtheir axes in alinement, the adjacent ends of the shafts being adaptedto receive and clamp a blank between them; a carriage,

movable on the base, an abutment on the carriage and a cam on themovable shaft, said cam having an in cline Whereon the abutment rides asthe carriage approaches the shafts and forces the movable toward thefixed shaft to clamp a blank between them, and a plane perpen dicnlar tothe shaft wherconthe abutment rides after it has passed the incline,said plane being slightly lower than the big-hes part'of the incline,thereby permitting" a. slight retrogression of the shaft and cornsequent relief of end thrust in the bearings; a constantly rotatingshaft, means for moving the carriage, a clutch to connect the rotatingshaft with one of the blank-carrying shafts, and automatic means forthrowing adapted to support in the clutch when the abutment has reachedable toward the fixed shaft to clamp a blank between them, and a planeperpendicular to the shaft Whereomthe abutment rides after it has passedthe incline, said plane bcir of incline, thereby permitting a slightretr gression of the shaft and consequent relief of end thrust in thebearings; a constantly rotating shaft, a toggle whereby to more thecarriage, a clutch to connect the rotating shaft with one of the blanlrcarrying shafts, a connection between clutch whereby to throw thecarriage reaches a predetermined point with reference to the blankcarrying shafts,

the toggle and in the clutch when 1 a constantly rotating shaft, atoggle whereand screw opera-tea ad usting means for varying the distancebetween the axes of a blank between them, and a plane perpenalongitudinally fixed shaft'and a long1- tudinally movable shaft mountedin bearings on the base with their axes in alinement, the adjacent endsof the shafts being adapted to receive/and clamp 21 blank between them:a carriage. aoapted to support a die-roll, transversely movable on'thebase, an abutment on. the carriage and a cam on the movable shaft. saidram. having an in' cline whereon the abutment rides as the carriageapproaches the shafts and forces the movable toward the fixed shaft toclamp dicular to the shaft whereon the abutment rides after' it haspassed the incline, said plane being slightly lower than the high-f estpart of the incline, thereby permitting a slight retrogressionoftheshaft and consequent relief of end thrust in the bearings;

bv to move the carriage. automatic means for connecting the rotatingshaft to the' blank-carrying shaft when the abutment has reached theplane, and means for adjusting the position of the abutment withreference 7 to the carriage.

. tween them; a carriage,

. rides after it has passed the incline-said plane beingslightly lowerthan the highest, .50

longitudinally fixed point, I

41. In a gear rolling machine, a base, a

shaft and a longitudinally movable shaft mounted in bearings on the basewith their axes in alinement, the adjacent ends of the shafts beingadapted to receive and clamp a blank bea die-roll, transversely movableon the base, anabutment on the carriage and a cam on the movable shaft,said cam having an in-' cline whereon the abutment rides as the carriageapproaches the shafts and forces the movable toward the fixed shaft toclamp a blank between them, and a plane p'erpendicular to the shaftwhereon the abutment part, of the incline, thereby permitting a slightretrogression of the shaft and consequent relief of end thrust in thebearings; a constantly rotating shaft, a toggle whereby to move thecarriage, a clutch to connect the rotating'shaft with one of' theblank-carry ing shafts, a connection between the toggle and clutchwhereby the clutch is thrown in when the. carriage reaches. apredetermined a screw to operate the toggle, anda and a blank-holderrotatably mountedwvith their axes constantly parallel, means for clutchto connect the screw-- with the rotating shaft. 2 =42; Ina-gear rollingmachine, a base,'a

longitudinally fixed shaft and a longitudimounted in-loearingspn ymovable shaft axes in alinement, the

nal

adapted to support adjacent ends of the shafts being adapted to receiveand clamp a blank between them; a carriage, adapted to support adie-roll, transversely movable on the base, an abutment on the carriageand a cam on the movable shaft, said cam having an incline whereon theabutment rides asthe carriage approaches the shafts and forces themovable toward the fixed shaft to clamp a blank between them, and aplane perpendicular to the shaft whereon the abutment rides after it haspassed the incline, said plane being sli htly lower than the l iigtdstpm-t of the incline, thereby pe r liiitting a slight retrogression ofthe shaft and consequent relief of end thrust in the bearings; aconstantly rotating shaft, a toggle whereby to move the carriage, aclutch to connect the rotating shaft to one of the blank-carryingshafts, a connection between the toggle and clutch whereby the clutch isthrown in when the carriage reaches a predetermined point, a screw tooperate the toggle, and

'means whereby the rotating shaft may be made to rotate the screw ineither direction. 43. In a gear rolling machine, the combination of arotatably mounted shaft carrying a blank-holder, a gear rigidly securedto the shaft,a second gear rotatably mounted with its axis parallel tothe first 'and their teeth enmeshed, a die-roll adapted to roll teeth ongears 'rotatably mounted, with its axis parallel to the shaft andcapable of moving toward ,the shaft without disturbingthe parallelism,and a connection between the die-rolLand second gear so constructed thatthey rotate at the same velocity while permitting the die-roll toapproach the shaft.

44. In a gear rolling machine, a pair of gears rotatably mounted withtheir teeth enmeshed and their axes fixed with reference to each other,a blank-holder connected to.

one of the gears and a die-roll adapted to roll teeth on gears connectedto the other, one of said connections-being so constructed that thedistance between the die-roll and blank-holder may be varied with novariation in their velocity ratio.

4:5. In a gear rolling machine, a blankholder and a die-roll rotatablymounted with their axes constantly parallel, means forvaryingthedistancebetween said axes,

'andconnecting means comprising gears with relatively fixed axes,whereby the blan'leholder and die-roll are caused to rotate at fixedspeed ratio while said distance varies.

varying the distance between saidaxes and means for maintaininsubstantially ,fixed velocity ratio during said variation.--

4:7. In a gear rolling machine, a die-roll 46. In a gear rollingmachine, adie-roll Y and a blank holder 'rotatably mounted With theiraxes constantly parallel, means for varying the distance between saidaxes, and means for maintaining fixed speed ratio between the die-rolland blank-holder, said means comprising "'intermeshing gears and auniversal joint.

48. In a gear rolling machine, a die-roll and a. blank-holder rotatablymounted, means for bringing the die-roll and a blank carried by theblank-holder into contact to form teeth on the blank, and means formaintaining fiXedvelocity ratio between the die-roll and blank-holder,said means comprising intermeshing gears and a universal joint.

49. In a gear rolling machine, means for supporting a blank, a die-roll,an operating connection between the blank and dieroll whereby they aremade to concurrently approach and roll against each other, and automaticmeans for causing suspension of said approach when the blank anddie-roll have attained a certain relative position.

50. In a gear rolling machine, a toothed die, a rotatable blank-holder,means for clamping a blank in the holder, a rotary element for rotatingthe blank holder, means for pressing the die teeth into a blank clampedin the rotating holder, whereby to form teeth on said blank, and meansoperated by said rotary element, whereby said blanlcclamping means andsaidmeans for pressing the die teeth into the rotating blank areoperated successively.

51. In a gear rolling machine, means for supporting a blank, a die roll,and an auto 'matic operating connection between the blank and die-rollwhereby they are made to concurrently approach and roll against eachother.

52. In a gear rolling machine, means for supporting a blank, a die-roll,and an automatic operating connection between the blank and die-rollwhereby they are made to concurrently approach and roll against eachother at a definite relative velocity.

53. In a gear rolling machine, means -for supporting a blank, adie-roll, means for rotating the die-roll and blank, and meansoperatively connected to said rotating means for producing relativemovement of approach between the die-roll and blank \vhereby to sink thdie roll teeth into the blank and form teeth thereon;

54. In a gear rolling machine, means for supporting a blank, a die-roll,means for rotating said blank and die-roll and means operativelyconnected to said rotating means for producing relative movement of approach between the die roll and blank at a definite velocity relative tothe velocity of rotation.

In a gear rolling machine, means for supporting a blank, a die-roll,means for rotating said blank and die-roll, and means operativelyconnected to said rotating means for producing relative movement ofapproach between the die-roll and blank at a variable but definitevelocity relative to the velocity of rotation.

56. In a gear rolling machine, means for supporting ablank, a die-roll,means for rotating the blank and die-roll, and means operativelyconnected to'said rotating means for producing relative movement ofapproach between the die-roll and blank at a diminishing but definitevelocity relative to the velocity ofrotation.

HAROLD N. ANDERSON.

Witnesses GEO. BUEHLER, R. IV. TOUNZEAU.

